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Australian Native Plants Society Canberra Region (Inc) AUSTRALIAN NATIVE PLANTS SOCIETY CANBERRA REGION (INC) Journal Vol. 19 No. 01 March 2017 ISN 1447-1507 Print Post Approved PP100000849 Contents A Walk on the Yerrabi Track Jo Walker 3 Acacia paradoxa flower galls, mystery partly solved Roger Farrow 9 Small Shrubs Masumi Robertson 11 Grafting Australian Native Plants Phil Trickett 15 Bloomin' Outback Roger Farrow 19 Rivers of Carbon — Rivers of Life Rosemary Blemings 23 Potty Croweas Bill Willis 26 Sprummer Field Trips Roger Farrow 29 Our Environment — Temperature Masumi Robertson 36 Banksia Study Group Reactivated Kevin and Kathy Collins 40 Christmas Party 2016 photos 42 Study Group Notes Brigitta Wimmer 45 Treading Lightly Rosemary Blemings 46 ANPS Canberra contacts and membership details inside back cover Cover: Blandfordia nobilis, Little Forest Plateau, Morton National Park; Photo: Catriona Bate Journal articles The deadline dates for submissions are 1 February (for The Journal is a forum for the exchange of members' March edition), 1 May (June), 1 August (September) and others' views and experiences of gardening with, and 1 November (December). propagating and conserving Australian plants. Send articles or photos to: All contributions, however short, are welcome and Journal Editor may be accompanied by photographs or drawings. Gail Ritchie Knight The editor reserves the right without exception to edit 1612 Sutton Road all articles and include or omit images as appropriate. Sutton NSW 2620 Submit photographs as either electronic files, such e-mail: [email protected] as JPEGs, or prints. Set your digital camera to take tel: 0416 097 500 high resolution photos. Please send JPEGs separately Paid advertising is available in this Journal. Contact and not embedded in a document. If photos are too the Editor for details. large to email, copy onto a CD or USB drive and send Society website: http://nativeplants-canberra.asn.au it by post. Please enclose a stamped, self-addressed Printed by Elect Printing, Fyshwick, ACT envelope if you would like your prints returned. If you http://www.electprinting.com.au/ have any queries please contact the editor. Original text may be reprinted, unless otherwise indicated, provided an acknowledgement for the source is given. Permission to reprint non-original material and all drawings must be obtained from the copyright holder. The views and opinions expressed in articles are those of the authors and are not necessarily the views and opinions of the Society. A Walk on the Yerrabi Track, Namadgi National Park The sun came out after lunch revealing the view from near the Boboyan Trig Text: Jo Walker; Photos: Jean Geue 25 January 2017 By the time we reached the Boboyan Trig carpark to start our walk, we were enveloped in a white mist which kept us unexpectedly cool all morning until we got to the highest part of the track. The beginning of the track descends gently through a forest of mainly Persoonia chamaepeuce Broad-leaved Peppermint trees (Eucalyptus dives) towards a swampy edge of the track was an Anchor grassland. The low understorey Plant (Discaria pubescens) covered on the slope consisted mainly of in an unusually large number of Podolobium alpestre and Persoonia small green seed capsules. As we chamaepeuce with a few Exocarpos strolled down the lower and much strictus. An interesting find at the moister end of the slope, Bulbine Journal, Australian Native Plants Society, Canberra Region Inc — March 2017 3 Discaria pubescens Podolepis hieracioides bulbosa and Podolepis hieracioides brightened up the scene with their yellow flowers. The track traverses one edge of the swamp, with a wide vista of Snowgrass (Poa sieberiana) to the left and a crescent of Black Sallee (Eucalyptus stellulata) sheltering the far side. Amongst the grass tussocks were more Bulbine bulbosa, and near the path in the more open areas Hypoxis hygrometrica and a few Geranium antrorsum nestled close to the ground. But the most noticeable plant, adorning the edge of the path for some distance, was Trachymene humilis. These are in the carrot Leptospermum myrtifollum, still in flower family (Apiaceae) and bear multiple- flowered flat white flowerheads The under-storey there is mostly the on short stems. Some shrubby mountain form of Acacia dealbata vegetation included Leptospermum and the silvery blue-green foliage myrtifolium, white-flowering against a backdrop of dark misty Baeckea utilis and a few Hakea forest brought to mind intricate microcarpa in seed. embroidery. Amongst the wattles, After the flat stroll, we came to an a few Olearia megalophylla were upward path through Snow Gums growing — and a large Clematis (Eucalyptus pauciflora) and Mountain aristata, heavily laden with almost- Gums (E. dalrympleana). ripe seed-heads, covered a fallen log. 4 Journal, Australian Native Plants Society, Canberra Region Inc — March 2017 Fog at the beginning of the walk in dry forest where Eucalyptus dives (Broad-leaved Pepermint) dominates As we approached the Boboyan is Shannon’s Flat adamellite and is Trig at the top of the track the mist even older than the shale, some 475 cleared. Burgan (Kunzea ericoides) million years old. As well as giving was growing thickly in places, an incredible insight into the Earth’s still bearing its white flowers. The history, the smooth granite proved mountain form is a bit different to be an ideal lunch spot. to those growing locally at lower The track continues down some altitudes — they are lower-growing steep and elderly concrete steps and have brighter green leaves. through a narrow cleft in the Scattered amongst the rocks around rocks, eventually ending on a wide the trig were lots of pink-flowering expanse of granite from where you Pelargonium australe and a few can see most of the mountain peaks Veronica perfoliata. in the National Park — on a good In the vicinity of the Trig, the day, that is! By then, we had come geology changes markedly from the out of the cloud, but it extended dark and flaky 410 million-year-old mistily right along the valley below. metamorphosed sedimentary rocks So we had to assume the vista we’d been walking on to dark- displayed on an information board flecked pale grey granite. The latter was there in the mist somewhere. Journal, Australian Native Plants Society, Canberra Region Inc — March 2017 5 Exocarpos strictus 6 Journal, Australian Native Plants Society, Canberra Region Inc — March 2017 Some other plants were found brown mottled lizard, probably a there, anyway — a few Pomaderris species of Ctenotus. phylicifolia and some Phebalium And twice we saw furry caterpillars squamulosum ssp ozothamnoides. hosting multiple bright red mites And several clumps of Dianella (as pictured in Roger Farrow’s book tasmanica, heavily laden with Insects of Southeastern Australia still-green fruit, were growing in p.159). But the insect highlight was a the shelter of the rocks. Some little female Mountain Cricket in warning native animal obviously found them display mode, exhibiting the bright tasty, as there were several piles red and blue colours below her raised of fresh skins with the fleshy parts dark wings. entirely eaten out. We even found some food as the There were other signs of wildlife Exocarpos strictus plants were along the way. The birds stayed bearing their pale pink fruit (or, mostly amongst the trees, but we more correctly, the edible swollen heard Gang-gangs, Yellow-tailed pedicels — the fruit is the tiny hard Black Cockatoos and Leaden seed at the tip). Flycatchers plus other unidentified calls. We saw a beautiful gold and Altogether it was a lovely walk, without experiences ranging from standing on massive rocks old enough to defy imagination to watching tiny insects carry out the intricacies of their short lives amongst the vegetation. Exocarpos strictus and friend Journal, Australian Native Plants Society, Canberra Region Inc — March 2017 7 Morning tea in the mist, Yerrabi Track, Namadgi National Park 8 Journal, Australian Native Plants Society, Canberra Region Inc — March 2017 Acacia paradoxa flower galls Mystery partly solved Text and photos by Roger Farrow In an article entitled A Galling Paradox, in the 2014 September edition of our journal, I described some unusual flower galls found on Acacia paradoxa in the Burra section of the Tinderry Nature Reserve in May during a Wednesday Walk. At this time, the galls were empty and grey in colour and each had a small hole indicating that the causal agent, probably a gall-wasp, had emerged and left. During the following spring, I found Figure 2: Acacia paradoxa flower gall immature galls replacing the axillary flowers of A. paradoxa nearer at hand On December 25, we were away for the along Urila Road. When I returned in festivities and when we returned on January 2015 to collect mature galls I the 26th the container of gall-bearing found them empty as the causal agent branches was full of hundreds of tiny had again emerged previously. This wasps (Fig 3). happened again in January 2016 so in December 2016 I collected some twigs of A. paradoxa (Fig 1) with clusters of mature galls that had few emergence holes (Fig. 2). Figure 3: Chalcid gall-wasps Figure 1: Acacia paradoxa flower gall Journal, Australian Native Plants Society, Canberra Region Inc — March 2017 9 emerging wasps so each infested host bush, containing several hundred of these compound galls, can produce upwards of a thousand wasps. However, another question is: what these fragile wasps do after emergence until the new flower buds form in autumn. Is there an alternative host plant or do the wasps aestivate till autumn? Adult survival of the wasp could be the crucial Figure 4: Chalcid gall-wasps factor in the level of gall infestation in A. paradoxa. An inspection under the microscope About another gall (Fig 4) showed them to be gall wasps probably in the family Pteromalidae In 2012, I photographed an unusual line and possibly a species of Trichilogaster of spindle-shaped galls on a yellow box that is known to produce flower galls at Queanbeyan Nature Reserve.
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